One day, Mr. Keene called all the students and teachers together and said, "This is a fine, fine school! From now on, let's have school on Saturdays too."

And then there was more.
School all weekend.
School on the holidays.
School in the SUMMER!
What was next ...
SCHOOL AT NIGHT?

So it's up to Tillie to show her well-intentioned principal, Mr. Keene, that even though his fine, fine school is a wonderful place, it's not fine, fine to be there all the time. Newbery Medal-winning author Sharon Creech and celebrated New Yorker cartoonist Harry Bliss team up in this charming and hilarious book about what happens when the love of learning goes a bit too far.